I have heard of tipping the mailman, but I've never actually done it. To be honest, I don't even know if I like my mailman that much. I've noticed that if he can't get to the mail box he uses his truck to ram the nearby trash containers out the way and also when he is stopping to fill the mail boxes he then doesn't indicate that he's pulling back out on to the road. I was in a row of cars over-taking a stationery mail truck and he just pulled out, no indication or anything!